GUATEMALA CITY (Reuters) – Anti-corruption crusader Bernardo Arevalo took office as Guatemala’s president early on Monday after a chaotic inauguration caused by a last-minute attempt by opposition lawmakers to weaken his authority. After a delay of nearly nine hours, the newly sworn-in president and Vice President Karin Herrera made their first appearance at the National Palace of Culture to greet a crowd that had assembled at the capital’s Plaza de la Constitucion. In a speech, Arevalo pledged to Guatemala’s indigenous peoples “not to leave you behind” and vowed “no more discrimination, no mo…